@article {Zhou:2022:0736-2935:393,
title = "A simple four-pole solution with FEM/BEM validation to estimate the effectiveness of compact resonators in large silencers",
journal = "INTER-NOISE and NOISE-CON Congress and Conference Proceedings",
parent_itemid = "infobike://ince/incecp",
publishercode ="ince",
year = "2022",
volume = "264",
number = "1",
publication date ="2022-06-24T00:00:00",
pages = "393-399",
itemtype = "ARTICLE",
issn = "0736-2935",
url = "https://ince.publisher.ingentaconnect.com/content/ince/incecp/2022/00000264/00000001/art00041",
doi = "doi:10.3397/NC-2022-747",
author = "Zhou, H. and Wu, T. W. and Wang, P. and Engel, J. P.",
abstract = "Large absorptive silencers are used in the power generation industry to abate intake or exhaust noise. They are very effective at mid to high frequencies; however, low-frequency performance is an area of concern for absorptive silencers. Hybrid baffles and bars with empty space reserved
for a quarter wavelength duct design have been used to target low-frequency tonal noise with some success. Although, at times the hybrid baffles or bars themselves are not enough to reduce the low-frequency noise to an acceptable level. Synonymously, the overall high-frequency performance
may suffer due to the loss of space that could be used for more dissipative elements such as absorptive baffles or bars. Compact resonators with a tapering neck may then be considered as an add-on to improve the low-frequency performance. In this paper, a simple four-pole solution is utilized
to estimate the first natural frequency of a compact resonator. The end correction factor is then empirically correlated to the finite element method (FEM) or boundary element method (BEM) solution. The small compact devices have a potential application to provide engineers with a very flexible
design add-on strategy without significantly altering the installed silencer design, and their target frequencies can also be adjusted depending on the situation.",
}